Lets play with decorators

DelegateWholeClass.rb

require "delegate"

class A
  def self.class_meth
    "class method"
  end

  def self.class_meth_with_args a, b
    "class method args: " + a + b
  end

  def meth
    "instance method"
  end
end

#
#It works!
module DelegateWholeClass
  #borrowed from Delegate.delegating_block
  def self.delegate_block(mid, target)
    lambda do |*args, &block|
    begin
      target.__send__(mid, *args, &block)
    ensure
      $@.delete_if {|t| /\A#{Regexp.quote(__FILE__)}:#{__LINE__-2}:/ =~ t} if $@
    end
    end
  end
end

def DelegateWholeClass(superclass)
  klass = DelegateClass(superclass)
  klass_methods = superclass.public_methods - klass.public_methods

  klass_methods.each do |meth|
    klass.define_singleton_method(meth,DelegateWholeClass.delegate_block(meth, superclass))
  end

  klass
end


class T < DelegateWholeClass(A)
  def meth
    super + "<- from A"
  end
  
  def t_meth
    "T:" + meth
  end
  
  def self.t_class_meth
    "T class meth"
  end 

  def self.class_meth
    super + "<- from A"
  end
end

t = T.new A.new
puts t.meth
puts T.class_meth
puts T.class_meth_with_args "bla," , 1.to_s

puts t.t_meth
puts T.t_class_meth